MTD 248-645A Manual de usuario descargar pdf (Pagina 67)

Linux From Scratch - Version 7.0

In case the above seems hard to follow, let's break it down a bit. First we find all the files under the gcc/config

directory that are named either linux.h, linux64.h or sysv4.h. For each file found, we copy it to a file of the

same name but with an added suffix of “.orig”. Then the first sed expression prepends “/tools” to every instance of

“/lib/ld”, “/lib64/ld” or “/lib32/ld”, while the second one replaces hard-coded instances of “/usr”. Then we add our

define statements which alter the include search path and the default startfile prefix to the end of the file. Finally, we

use touch to update the timestamp on the copied files. When used in conjunction with cp -u, this prevents unexpected

changes to the original files in case the commands are inadvertently run twice.

On x86_64, unsetting the multilib spec for GCC ensures that it won't attempt to link against libraries on the host:

case $(uname -m) in

x86_64)

for file in $(find gcc/config -name t-linux64) ; do \

cp -v $file{,.orig}

sed '/MULTILIB_OSDIRNAMES/d' $file.orig > $file

done

;;

esac

As in the first build of GCC it requires the GMP, MPFR and MPC packages. Unpack the tarballs and move them

into the required directory names:

tar -jxf ../mpfr-3.1.0.tar.bz2

mv -v mpfr-3.1.0 mpfr

tar -jxf ../gmp-5.0.2.tar.bz2

mv -v gmp-5.0.2 gmp

tar -zxf ../mpc-0.9.tar.gz

mv -v mpc-0.9 mpc

Create a separate build directory again:

mkdir -v ../gcc-build

cd ../gcc-build

Before starting to build GCC, remember to unset any environment variables that override the default optimization

flags.

Now prepare GCC for compilation:

CC="$LFS_TGT-gcc -B/tools/lib/" \

AR=$LFS_TGT-ar RANLIB=$LFS_TGT-ranlib \

../gcc-4.6.1/configure --prefix=/tools \

--with-local-prefix=/tools --enable-clocale=gnu \

--enable-shared --enable-threads=posix \

--enable-__cxa_atexit --enable-languages=c,c++ \

--disable-libstdcxx-pch --disable-multilib \

--disable-bootstrap --disable-li/jointfilesconvert/297116/bgomp \

--without-ppl --without-cloog \

--with-mpfr-include=$(pwd)/../gcc-4.6.1/mpfr/src \

--with-mpfr-lib=$(pwd)/mpfr/src/.libs

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MTD 248-645A Manual de usuario Pagina 67